Buchi K-424 Bedienungsanleitung

Digestion Unit K-424

Contents

Read these instructions thoroughly before you use the

Digestion Unit K-424. Store these instructions in the im-

mediate vicinity of the apparatus so that they may be consulted

at any time.

The unit must only be connected to the mains and switched

on after having completed all necessary preparations.

Chapter 2 contains important safety information. Knowledge

of this is imperative for the safe operation of the Digestion

unit.

Subject to technical change without notice. No part of these

instructions may be reproduced in any form whatsoever or

processed, reproduced or disseminated by means of

electronic or optical systems without the express written

en, Version E Order No.

K-424 Operating instructions 96711

1 Scope of delivery 2

2 Safety 3

2.1 Symbols 3

2.2 Requirements for the operator 3

2.3 Regulation use 3

2.4 Non-regulation use 3

2.5 General hazards 4

2.6 Safety measures 4

3 Function 6

3.1 Principle of operation 6

4 Putting into operation 7

4.1 Setup location 7

4.2. Unpacking 7

4.3 Connection to the mains 7

4.4 Hose connections 8

5 Operation 9

5.1 Operating elements 9

5.2 Operating elements and their function 9

5.3 General information 9

5.4 Execution of the Kjeldahl disintegration 11

5.5 Malfunctions 11

6 Maintenance 12

6.1 General information 12

6.2 Upkeep 12

6.3 Gaskets 12

6.4 Replacing the insulation 13

6.5 Replacing the O-rings 13

6.6 Fuses 14

6.7 Customer service 14

7 Taking out of operation 15

7.1 Storage/Transport 15

7.2 Disposal 15

8 Replacement parts 16

9 Appendix 17

9.1 Technical Data 17

9.2 Materials used 17

9.3 FCC requirements 18

9.4 Declaration of conformity 19

Digestion Unit K-424

1 Scope of delivery

Fig.1: Overview K-424

Description Order No.

Versions:

K-424 standard 120 V 50 / 60 Hz 37963

K-424 standard 230 V 50 / 60 Hz 37962

Table 1: Versions

Enclosed parts:

4 Digestion tubes 37377

1 Rack 26730

1 Upper insulating plate 26736

1 Suction module complete 26842

1 Connection to suction module 26875

1 Digestion tube holder complete 38080

1 EPDM Hose 8mm 26275

1 Mains cables:

Type CH 10021

Type Schuko 10029

Type GB 17833

Type AUS 17834

Type USA 33756

1 Operating instructions in one of the

following languages

German 96710

English 96711

French 96712

Italian 96713

Spanish 96714

1 Packaging 26799

Table 2: Enclosed parts

Accessories:

Water jet pump plastic 02913

Glass cap 17396

Gasket PTFE to suction tube 22442

Collection tube for suction tube 27737

Condensation bottle complete 25100

Suction module for H2O2 digestion 37399

Büchi B-414 Scrubber 37876

Suction pipe with condensation gutter 26880

Non Kjeldahl digestion set 43677

Suction pipe with ball joint 40158

Table 3: Accessories

Digestion Unit K-424

2 Safety

The apparatus has been built in accordance with state-of-

the art technology and recognized safety regulations.

Nonetheless risks and dangers can arise from the

apparatus:

• If the apparatus is operated by insufficiently trained

personnel.

• If the apparatus is not used as directed.

2.1 Symbols

Stop

Information on dangers which can lead to serious damage

to property, to severe or life-threatening injuries.

Warning

Information on dangers which can lead to damage to health

or property.

Please note

Information on technical requirements. Noncompliance can

lead to faults, inefficiency and production losses.

2.2 Requirements for the operator

The unit is only to be used by laboratory and specialist

personnel and other persons, who, because of their training

or professional experience, are able to assess the dangers

which can result while operating the equipment.

2.3 Regulation use

The unit is conceived and built as a piece of laboratory

equipment. Its regulation use is the heating of concentrated

sulfuric acid used in the oxidation of organic samples.

2.4 Non-regulation use

Any other use than listed as well as any use which does

not correspond to the technical data is a misuse. The

operator bears sole risk for eventual damage related to

such use.

In particular the following uses are not allowed:

• operation in explosion-prone areas

• operation with samples that can explode or ignite due to

impact, friction, heat or sparking.

2 Safety

Digestion Unit K-424

2.5 General hazards

General hazards arise from:

• Hot sulfuric acid

• Combustible gases or vapors in the immediate vicinity

of the apparatus

• Damaged glassware

• Location of the apparatus to close to the wall (see

section 4.1 Set up location)

• Hot surfaces

Except for authorized repair personnel it is forbidden to remove

covers using commercially available tools.

The device must not be put into operation with damaged

glass parts.

Contact with electrically live parts presents a danger to life

and limb!

2.6 Safety measures

It is recommended that the apparatus be operated

exclusively under an exhaust hood.

The wearing of personal safety equipment such as safety

glasses, gloves and lllllaboratory coats is necessary.

As a necessary part of the digestion unit K-424, this instruction

manual must at all times be available to the operating

personnel at the location where the apparatus is being

used. This also applies to the further editions in other

languages which may be ordered seperately.

Modifications

Any modifications on the apparatus itself or on replacement

or accessory parts, and any use of replacement or

accessory parts other than those listed in these operating

instructions is permissible only with the express written

approval of Büchi Labortechnik AG.

Responsibilities of the operator

The operator is responsible for providing proper instruction

for his staff. For that purpose, these operating instructions

may also be ordered in other languages.

The operator must inform the manufacturer immediately of

any and all events relevant to product safety that arise

during his operation of the apparatus.

If assuming that a safe operation is not possible any more

the unit must be put out of operation and secured against

unintended further operation.

2 Safety

Digestion Unit K-424

2 Safety

It is to be assumed that a safe operation is not possible

any more

sif the unit is visibly damaged,

sIf the unit is not functioning any more

safter long storage under anfavourable conditions,

safter being transported under difficult conditions.

The unit must not be operated with combustible substances.

If you need the assistance of Büchi Service, it is required

to indicate and declare eventually remaining dangerous

substances (e.g., as defined in EC guidelines L 360, 1976/

79 or VBG 16) in or on the apparatus for reason of on-the-

job safety or pollution control.

Digestion Unit K-424

3 Function

The digestion unit K-424 is suitable for digestions involving

concentrated boiling sulfuric acid at a temperature of

approximately 370° C.

3.1 Principle of operation

Sample tubes

Heating

Suction module

Hose to water jet pump or to Scrubber B-414.









Fig. 2: Principle of operation K-424

Digestion Unit K-424

4 Putting into operation

4.1 Setup location

The digestion unit must be installed on a stable, clean and

flat base.

For reasons of safety, a gap of at least 30 cm must be left

open between the back of the machine and the wall or

other objects. Never place any containers, chemical

products or other equipment behind the digestion unit.

4.2 Unpacking

The original package must be kept for possible later

transport.

If the package has been damaged, check the machine

carefully for broken glass or damage to the housing.

Make certain that the socket voltage is the same as that

shown on the machine nameplate. Always connect the

machine to an earthed (grounded) socket. This avoids risks

due to an internal defect.

4.3 Connection to the mains

Before switching on the K-424 for the first time check that

the voltage on the socket corrsponds to the voltage

indicated on the apparatus identification plate.

Always connect the apparatus to a grounded (earthed)

socket.

External couplings and extension cords must contain a

protective conductor ( 3-pole couplings, cables, and plug-

in devices). Any and all interruptions in the protective

conductor are forbidden. This avoids risks due to an internal

defect.

Digestion Unit K-424

4 Putting into operation

4.4 Hose connections

Mount the safety shield (A) with the fitted hoses on the unit

(see photograph).

Assemble the connection to the suction module (B) and install

on the hose (C) and on the suction modules (D).

Connect the EPDM hose to the scrubber B-414 or to the

water jet pump (e.g. made from plastic) Art. No. 02913.

When working with a water jet pump unpleasant odours

may escape into the environment if the suction is not power-

ful enough.

Fig. 3: Hose connections enlarged section

Fig. 4: Connection to fume exhaust

026757 002073

026240 003577

Scrubber E

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